following table gives the activity time estimates for an activity in project. Optimistic Time Most Likely Time (hours) (hours) Activity Printing the Invitation cards a. What is the expected activity duration (te) for the activity? b. What is the variance of activity ()? 2 2.5 Pessimist (hou E Following table gives the activity time estimates for a. What is the expected activity duration (te) for the activity? b. What is the variance of activity (2) ?.